Cherbourg is protected by Cherbourg Harbour, between La Hague and Val de Saire, and the city has been a strategic position over the centuries, disputed between the English and French. Cited as one of the "keys to the kingdom" by Vauban, it became, by colossal maritime development work, a first-rate military port under the leadership of Napoleon I, and holds an arsenal of the French Navy. A stopping point for prestigious transatlantic liners in the first half of the 20th century, Cherbourg was the primary goal of US troops during the invasion of Normandy in 1944.

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